Results 71 to 80 of about 210,013 (270)

Modulation of Epigenetic Control by Advanced Molecular Tweezers

Chemistry – A European Journal, EarlyView.
Tailored dimeric molecular tweezers recognize the DNA‐binding part of Histone H4 and interrupt the essential histone‐DNA interaction. ABSTRACT This work addresses the question if supramolecular systems can be tailored to interfere with posttranslational modifications (PTM) and epigenetics.
My‐Hue‐Le, Bianca Kamba, Anja Matena, Christine Beuck, Victoria Momand, Spiros Salvanos, Jessica Vossen, Mike Blueggel, Thomas Schrader, Peter Bayer   +9 more
wiley   +1 more source

Hybrid Disila-Crown Ethers as Hosts for Ammonium Cations: The O–Si–Si–O Linkage as an Acceptor for Hydrogen Bonding

Inorganics, 2018
Host-guest chemistry was performed with disilane-bearing crown ethers and the ammonium cation. Equimolar reactions of 1,2-disila[18]crown-6 (1) or 1,2-disila-benzo[18]crown-6 (2) and NH4PF6 in dichloromethane yielded the respective compounds [NH4(1,2 ...
Fabian Dankert, Kirsten Reuter, Carsten Donsbach, Carsten von Hänisch   +3 more
doaj   +1 more source

Hydrogen Release From Silicon─Hydrogen Systems: From Surface Chemistry to Higher‐Coordinate Molecular Mechanisms

Chemistry – A European Journal, EarlyView.
Hydrogen‐release processes in silicon chemistry occur across a broad spectrum of systems, including crystalline silicon surfaces, nanoporous materials, Zintl phases, and molecular hydrides. This Review highlights how Si─H activation and H2 evolution are governed by structure, coordination environment, and dynamic access to reactive geometries, with ...
Robin Rothfelder, Jonathan O. Bauer
wiley   +1 more source

Crown ethers can enhance enzyme activity in organic solvents

, 1992
The effect of various crown ethers on the transesterification reaction of N-acetyl(L)phenylalanine ethyl ester with propanol catalyzed by α-chymotrypsin was investigated. Crown ethers can strongly enhance this reaction in different organic solvents.
Tramper, J., von Stockar, U., Beeftink, H.H., Vermüe, M.H., Verboom, Willem, Broos, Jaap, Engbersen, Johan F.J., Reinhoudt, David N.   +7 more
core   +2 more sources

Synthesis of Chiral‐at‐Sulfur(VI) Sulfonimidamide Brønsted Acids

Chemistry – A European Journal, EarlyView.
A simple, modular route to chiral‐at‐sulfur(VI) Brønsted acids is described, delivering S‐chiral sulfonimidamides, C2‐symmetric acids, and BINOL‐based hybrid systems through stereospecific reactions of sulfonimidoyl fluorides and chlorides. ABSTRACT Herein, we report an efficient and simple strategy to access diverse chiral‐at‐sulfur(VI) Brønsted acids.
Yu Han, Natassa Lional, Dieuwertje E. Streefkerk, Jesse M. S. Goed, Bo Chen, Han Zuilhof, Fedor M. Miloserdov   +6 more
wiley   +1 more source

Luminescent Lariat Aza-Crown Ether Carboxylic Acid

Molbank, 2010
Lariat ethers are interesting recognition motifs in supramolecular chemistry. The synthesis of a luminescent lariat aza-crown ether with a carboxyl group appended by azide-alkyne (Huisgen) cycloaddition is presented.
Burkhard König, Eva-Maria Rummel, Andreas Späth   +2 more
doaj   +1 more source

Persilylated and Related Silyl Anion‐Induced Synthesis of Group 3–10 Metal–Silyl Complexes

Chemistry – A European Journal, EarlyView.
Persilylated and related silyl anions serve as powerful tools for constructing metal–silyl complexes across group 3–10 elements. Their strong σ‐donating ability and steric bulk stabilize low‐coordinate, reactive species and enable unique bonding motifs.
Yusuke Sunada
wiley   +1 more source

A Study on the Removal of Chromium(VI) Oxanions from Acid Solutions by Using Oxonium Ion-Crown Ether Complexes as Mobile Carrier Agents [PDF]

Iranian Journal of Chemistry & Chemical Engineering, 2007
Crown ethers 12-crown-4 (12C4), benzo-15-crown-5 (B15C5), 18-crown-6 (18C6), nitrobenzo-18-crown-6 (NB18C6) dibenzo-18-crown-6 (DB18C6) and dicyclohexyl-18-crown-6 (DC18C6), dissolved in dichloromethane, are able to form oxonium-ion complexes in contact ...
Massoumeh Parinejad, Mohammad Reza Yaftian   +1 more
doaj  

Two‐Coordinate 13‐Electron PdI Complexes Stabilized by the Bulky DIMeIHeptCl NHC Ligand

Chemistry – A European Journal, EarlyView.
Bulky N‐heterocyclic carbene (NHC) ligand DiMeIHeptCl stabilizes rare two‐coordinate 13‐electron PdI species. These monomeric complexes are directly observed crystallographically and by electron paramagnetic resonance (EPR) spectroscopy, and display unusual structures and radical‐type reactivity, forming Pd0(NHC) via Pd─X bond homolysis or ...
Volodymyr Semeniuchenko, Sepideh Sharif, Neha Rana, Nalin Chandrasoma, Wilfried M. Braje, R. Tom Baker, Jeffrey M. Manthorpe, William J. Pietro, Michael G. Organ   +8 more
wiley   +1 more source

The synthesis and study of a phosphine functionalized crown ether

, 2005
This study has resulted in a phosphine funetionalized crown ether. synrdiQ-methoxy-5-diphenylphosphino-1.3-cplyl l-24-crown-6, obtained tkmt a live step synthesis. 4-13romophenol was treated in turn with formaldehyde.
Keefer, Chad D.
core